- Aug 8, 2009
Yes, but with a high speed engine (RPM) on a low speed airframe (MPH) you still need a gear reduction with all the associated problems. My proposal in post # 17 was to take advantage of the required gear reduction to gain aditional benifits that would otherwise not be available and at the same time eliminate some of the potential problems that the conventional gear reduction introduces. For example,the planitary set preserves the concentric relationship with the engine shaft; a requirement for some re-engine applications. The gear rerduction does not need to mount to the engine, it can be directly mounted to the output shaft same as a direct drive propeller. The airframe does not need to handle the greater torque reaction that would normally be created with the required gear reduction.
Furthermore, I have had experiance with propellers somewhat approaching the example given. They do work better than the conventional propeller, however, they are more difficult to manufacture and therefore more expensive and also, in my applicaton, were more suseptible to damage.